短波网基于节点的抗毁性评估

给出了短波网基于节点的抗毁性定义和相应的评价方法。与通常的抗毁性评估方法相比,该方法简单有效,不需要大量复杂的计算。理论分析和实例均表明该方法是可行的。     

通信网络基于抗毁性的链路容量设计

本文定义了一种基于业务需求对的抗毁性量度，并且提出了一种相应的路径算法。在此基础上描述了通信网络基于抗毁性的链路容量设计方法。文中以一个８节点网络为例，给出了以该算法为基础的链路容量设计的计算机仿真结果。     

链路赋权军事通信网的抗毁性评估

为了研究链路赋权军事通信网抗毁性评估问题,引入了链路赋权网络的定义;系统地分析了军事通信网链路抗毁性评估指标体系、指标的评估标准、指标的权重系数计算方法,并给出了链路权重的确定方法;然后,从链路赋权网络的抗毁性测度出发,提出基于平均粘聚度的网络抗毁性评估方法;最后,通过实例对评估过程进行了说明。通过研究以期为推进军事通信网的规划和建设提供具有现实意义和实用价值的理论依据。     

嵌入式通信网络系统的抗毁性设计方法研究

嵌入式通信网络的运行环境复杂,降低了信息采集效率和通信网络协同控制任务性能。为了增强系统在复杂对抗环境下的协同性能,应提高系统的抗毁性。因此,采用LPC2290芯片作为微控制器,融合以太网模块、CAN模块、电源模块和相关外围接口模块,构建整个嵌入式通信网络系统。系统硬件电路结合子板和母板共同实现相关功能,提高系统的协同处理性能;采用基于Protocol_TCP协议的流套接子完成数据通信,增强通信系统的稳定性。依据嵌入式通信网络抗毁指标以及成本的最小化目标,设计网络抗毁性模型。将该抗毁性模型融入嵌入式通信网络自愈模型中,增强遭受攻击后网络的自愈能力,提高网络抗毁性能。实验结果表明,该设计系统具有较高的抗毁性,系统的吞吐量和平均时延性能较高。     

基于抗毁性和最小费用的网络优化设计方法

针对通信网网络优化设计提出了一种在网络抗毁性指标和网络最小费用之间进行均衡、折衷的优化设计方法。分析了通信网络的特点和设计要素,在此基础上提出了将通信网络进行模型化的方法,根据模型化后的图求出最小费用的连通网络结构,在尽量减少费用的前提下进行抗毁设计的修改。通信网络优化设计的最终设计目标是具有一定抗毁性指标且费用最少的网络拓扑结构。     

复杂电磁环境下机动通信网络抗毁性评估

在建立机动通信网络模型的基础上,分析了复杂电磁对抗环境的基本构成,探讨了敌方可能的基于重要性指标的攻击目标选择策略。建立了电子对抗条件下模拟环境模型。再结合节点连通性、信道带宽、信道丢失率和平均时延等多项指标,建立了复杂电磁环境下机动通信网络抗毁性评估模型,并完成了抗毁性评估计算及仿真分析。     

无标度网络的抗毁性评估研究

为了有效评估无标度网络的抗毁性,建立了一个基于业务需求参数的模型,提出了计算活跃路径和备份路径的方法.利用该模型可以建立抗毁性强、免受攻击的端到端连接.模型的核心思想是对于重要的业务,建立绕开中心的路径,这样重要的连接可以更好地抵御攻击.实验结果表明在最好情况下的最高等级服务中,受破坏减少的连接数为3.     

基于管理技术的ATM网络抗毁性研究

提出了基于管理技术的ATM网络抗毁性组织结构概念,指出了在网络规划设计与维护管理阶段进行层次化技术处理的重要性。ATM网络抗毁性组织结构要求在网络规划设计阶段、运用各种规划算法和仿真技术进行抗毁性设计与验证;在网络管理维护阶段,从网络各个层次,运用各种管理算法或机制维护网络抗毁性。在网络实际运行过程当中,该组织结构强调联合应用网络各层次上的抗毁性管理技术,充分发挥各个层次上的抗毁性,以提高整个网络抗毁性能。     

贝叶斯网络在体系结构工具评估中的应用

从20世纪90年代中期开始,体系结构研究和应用受到各国军方关注.体系结构工具是体系结构研究和应用中的关键技术.对体系结构工具进行评估是一个全新的领域.文章探讨了体系结构工具评估的问题,构建了初步的工具评估指标体系,提出了一个应用贝叶斯网络模型构建的工具评估的概率模型,并基于开源软件包BNT开发了评估模型的matlab程序,对三种体系结构工具进行了评估.     

宽带网传输中具有故障保护的高性能开关探讨

ITU-T与ANSI在SDH/SONET标准方面的进展，加快了世界各国在传输系统上的改造。其先进的OAM功能可用于建立起具有故障保护的自愈环网络，这种自愈环包括分插复用器（ADM）。ADM中的开关在其自愈环工作中起着重要作用，本文为确定其对ADM开关的需要，分析了自愈环结构与原理。在此基础上，介绍了能明显减少硬件数量的新的空分交换方法。     

Convergence of Protection and Restoration in Telecommunication Networks

This paper argues for the need for convergence of protection and restoration schemes in today's telecommunication networks. Such networks are presented both in a layered context and from an end-to-end perspective. Such convergence is both necessary to ensure inter-working amongst a multitude of technologies deployed and desirable to ensure simplified operations. This paper further identifies the issues and inter-working items that need resolution in today's telecommunication and data networks in order to achieve inter working amongst various existing and emerging restoration and protection schemes in a layered and end-to-end context. End-to-end context covers the access, metro, and long haul dimensions of the network. It also encompasses both the services and the transport layers of the network in the context of multi-domain, multi service provider networks. Layering issues arise from the mix of technologies at several layers for example: optical transmission and CWDM/DWDM at physical layer, SONET/SDH framing and management at layer-1, ATM, MPLS, Ethernet, and resilient packet rings at layer-2, and finally IP and routing protocols at layer-3. Given that some degree of routing and signaling intelligence is migrating down to the optical layer equipment, this whole layering concept is currently in transition. This paper shows the need for convergence in the form of a two level protection and restoration scheme. A service independent layer and a mesh restoration capability at the routing layer.     

Digital Gateways for Multimedia Home Networks

Residential networks are expected to open a huge market and introduce a bright, new era in telecommunications, by exponentially increasing the network usage, via broadband, added value services. Despite the business risks, investments made by the telecommunication industries clearly express the belief that the home networking market is about to take off. In this paper, a home network architecture for the provision of interactive multimedia services is considered and various access and indoor networking alternatives are presented. Then the focus is put on the Residential Gateway (RG), as a single point of networks convergence. Based on prototypes development, laboratory experiments and field trials throughout Europe and USA, a modular and a compact RG hardware architecture are described and compared, while the software architecture to support the RG functionality is described and the main building blocks are analyzed. Finally, a Web browser-based network management and control application that provides a visual metaphor of the RG is presented. This revised version was published online in September 2006 with corrections to the Cover Date.     

Ethernet-over-SONET(EoS) over WDM in Optical Wide-Area Networks (WANs): Benefits and Challenges

Ethernet has been playing an increasingly important role in wide area networks (WANs), from both a service perspective and a transport-technology perspective. Unlike its dominant presence in local area networks (LANs), Ethernet in WANs has been increasing its popularity in three different directions, i.e., Ethernet-based layer-2 virtual private network (L2VPN) over layer-3 network, Ethernet over SONET (EoS), and Ethernet directly over WDM channels or optical fibers. In this paper, we investigate the benefits and challenges of using next-generation SONET/SDH techniques—namely SONET/SDH virtual concatenation (VCAT) and link-capacity adjustment scheme (LCAS)—to support Ethernet-based data services in intelligent optical WDM wide area networks. In particular, we evaluate the network performance improvement after employing VCAT. In order to fully utilize VCATs inverse-multiplexing capability, several simple and effective heuristic algorithms are proposed and evaluated.*Part of the work was accomplished while Keyao Zhu was a Ph.D. student in the Networks Research Lab. at University of California, Davis, under the supervision of Professor Biswanath Mukherjee. Summarized versions of this paper were presented at the IEEE/OSA Optical Fiber Communication Conferences OFC03 and OFC04 in Atlanta, GA, in March 2003 and in Los Angeles, CA, in March 2004, respectively.Corresponding author     

光网络生存性技术研究

光通信技术的发展使光纤的带宽资源得到充分利用,提供了极大的传输容量,其生存性对主干网络性能和服务至关重要。该文首先介绍了网络生存性定义,然后分析了保护和恢复的生存性技术,最后阐述了多层保护与恢复技术的协调问题。     

Solving large-scale SONET network design problems using bee-inspired algorithms

In the past years, the number of users of Internet-based applications has exponentially increased and consequently the request for transmission capacity or bandwidth has significantly augmented. When managed properly, the ring networks are uniquely suited to deliver a large amount of bandwidth in a reliable and inexpensive way. In this paper, we consider two problems that arise in the design of optical telecommunication networks, namely the SONET Ring Assignment Problem (SRAP) and the Intraring Synchronous Optical Network Design Problem (IDP), known to be NP-hard. In SRAP, the objective is to minimise the number of rings (i.e., DXCs). In IDP, the objective is to minimise the number of ADMs. Both problems are subject to a ring capacity constraint. To solve these problems, we propose two bee-inspired algorithms: Hybrid Artificial Bee Colony and Hybrid Bees Algorithm. We hybridise the basic form of these algorithms with local search, in order to refine newly constructed solutions. We also perform comparisons with other algorithms from the literature and use larger instances. The simulation results verify the effectiveness and robustness of the proposed algorithms.     

基于多波长光传送网的网络保护与恢复

介绍了传送网的发展趋势和结构变化 ,分析了原有传送网的一些保护与恢复方式 ,然后着重分析了多层传送网保护与恢复方面的一些问题 ,提出了在基于多波长的多层融合光传送网中如何更好地实现保护与恢复的几种方法及原则 ,并进行了相应的对比和分析。     

无线网格网的跨层安全架构研究

概要介绍了无线网格网(WMN:wireless mesh networks)的发展状况、网络结构及主要优缺点,指出其是构建大规模无线宽带接入网络的一种经济、可行的理想方案;探讨了其安全服务的需求,在重点分析当前链路层和网络层安全协议的基础上,提出基于多信任域的跨层安全架构,来确保无线网格网中灵活高效的安全无线通信。